ClickHouse

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#include <DataTypes/DataTypeString.h>
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#include <Functions/FunctionStringToString.h>
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#include <Functions/LowerUpperUTF8Impl.h>
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#include <Functions/FunctionFactory.h>
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#include <Poco/Unicode.h>
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namespace DB
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{
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namespace
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{
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struct NameLowerUTF8
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{
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    static constexpr auto name = "lowerUTF8";
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};
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using FunctionLowerUTF8 = FunctionStringToString<LowerUpperUTF8Impl<'A', 'Z', Poco::Unicode::toLower, UTF8CyrillicToCase<true>>, NameLowerUTF8>;
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}
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REGISTER_FUNCTION(LowerUTF8)
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{
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    factory.registerFunction<FunctionLowerUTF8>();
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}
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}
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